Adjustable ceiling lamp



FIG. 1 is a top and rear perspective view of an adjustable ceiling lamp showing my new design;

FIG. 2 is a right side elevational view thereof on an enlarged scale;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a bottom plan view thereof on an enlarged scale;

FIG. 5 is a front elevational view thereof on an enlarged scale;

FIG. 6 is a top plan view thereof on an enlarged scale. 

The ornamental design for an adjustable ceiling lamp, as shown and described. 